The model news is really about exTS Sebastien which (IIRC) wasn't being shown on UK weather charts as a major feature until yesterday. Now we have it running along the south coast with weather warnings for rain at first in the SW and by Tue as far east as Sussex. See the Fax chart https://www.theweatheroutlook.com/twodata/chart.aspx?chart=///www.theweatheroutlook.com/charts/fax/PPVK89.jpg?cb=2 wih a 967mb centre off the S coast of Ireland.
GFS shows a brief spell of NE-ly winds in its wake but as above, I think only a baby cold snap as the airflow doesn't connect with deep cold in the Arctic and is in any case replaced by a strong rise in pressure over the UK (1035 mb on Tue 3rd), decayin into a zonal flow later that week. ECM develops the HP a bit further west and does have some colder air making its way south around the 2nd but it doesn't last.
Cold rampers should look at the ens runs as there is agreement there on a sharp cold spell 30 Nov-3 Dec (exc the SW), more than you would expect from the mainstream charts but even that goes back to seasonal average shortly after. The ens show less rain around the 27th than the MetO warnings would suggest, but add in a spike around the 1st for the south,
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Chichester 12m asl